Mortising-machine.



G. W. CAMPBELL.

Mom-:SING MACHINE. y y I APPLICATION FILED MAR. 2. |916- LQSQ. i4. Patented Dec. 31,- 1918.

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G. W. CAMPBELL.

MORTISING MACHINE.

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GEORGE W. CAMPBELL,

0F COLUMBUS, OHIO.

MORTISING-MACHINE.

Specification of Letters Patent.

Patented Dec. 31, 1918.

Application filed March 2, 1916. Serial No. 81,692.

To all 'w hom it may concern:

Be it known that l, GEORGE W. CAMPBELL, a citizen of the United States, residing at Columbus, in the county of Franklin and tate of Ghio, have invented certain new and useful improvements in Mortising-Machines, of which the following is a specification.

This invention relates to improvements 1n mortising machines, the improvements relating more particularly to the machine described in my application Ser. No. 7 80,625, filed July 23rd, 1913.

One of the objects of the invention is to improve the tool oscillating mechanism, first, by providing more effective devices for reversing' the direction of movement of the mechanism; second, to provide for more uniformly regulating the length of the mortise; third, for providing an improved swiveled connection between the tool carrier and the oscillating mechanism for the same; and fourth, to generally simplify and make more effective the operation of the oscillating mechanism as a whole.

object of the invention is to simplify and makemore effective the means for causing the tool to travel in a straight line throughout the length of the mortise and in this connection to also provide for eliminating lost motion in the tool and its carrier, thereby preventing the tool from being drawn into the work by hooking.

A further object of the invention is to simplify and make more effective the general construction of mortising machines of the character referred to.

1n the accompanying drawings :w

Figure 1 is a side elevation of a machine embodying my improvements.

Fig. 2 is an enlarged view, partly in section of the reversing mechanism shown in Fig. 3 is a section on the line 3-3 of Fig. 1.

Fig. holder and some of its Fig. 5 is a section tween the tool holder Figs. 6, 7 and 8 are reversing mechanism.

1n the drawings, 1 and 2 are guide rods connected together'at one end of the mai is longitudinal section of the tool associated parts. of the connection and the screw. details of parts of the chine by the handle portion 3 and at the other end of the machine by a slotted crossbar il, the upper and lower ends of which are provided with suitable clamps 5 for attaching the machine to the door or other work to be mortised as more fully shown in my pending application referred to. rPhe carriage for the operating parts is slidably mounted upon the'guide rods 1 and 2 and consists of side pieces 6 and 7 a rear connecting piece 8, forward connecting pieces 9 and 10 and a central cross piece 11; the carriage being provided with laterally eX- tending bosses 12 which are sleeved upon the guide rods 1 and 2.

.lournaled in the cross piece 11, the central portion of which is offset or depressed, and also in a small bracket 13 secured thereto is a shaft 1li to one end of which is connected a main operating wheel 15; a collar 16 serving to hold the shaft and wheel against longitudinal displacement. Pivoted upon the shaft is a tool holder 17 the holder being provided with an elongated opening 18 through which the shaft extends, the elongation of the opening being for a purpose to be explained hereinafter. The forward end of the holder is bored out to receive the shank 19 of the tool, an anti-friction ball 19a being preferably inserted between t-he inner ends of the shank and socket. rlhe holder is also provided with an open-sided enlargement or housing 17a within which is located a pinion 20 secured to the tool shank. The pinion 20 is in mesh with the teeth 21 on the side of the operating wheel 15 so that when the rwheel is operated the tool will be revolved.

Tool oscillating devices.

Revolubly mounted in bearings 22 which extend laterally from the carrier frame is a screw 23 upon which is threaded a head 24:. rlhe head 211 is swivelly connected with a block 25, which has a pin or stud 26 projecting into a recess in the head for this purpose. The block 25 is slidably mounted in ways 27 integrally formed with the tool holder 17, for the purpose hereinafter eX- plained. Loosely mounted upon an unthreaded portion of the screw 23 are beveled gears 28 and 29 and splined to the unthreaded portion of the screw between these connected to the collar 47 gears is a clutch member 30 arranged to be shifted into operative relation with either one of the gears. |The clutch member 1s in the form of a grooved collar having on each side thereof a projecting tooth 3lL and 32 each one of which is arranged to be thrown into the path of teeth 33 and 34 on the respective gears. A beveled pinion 35, is in mesh with each of the gears 28 and 29 and has its shaft journaled in the frame of the carrier, the opposite end of the shaft being provided with a pinion 36 (shown in dotted lines in F ig. l) in mesh with the internal gear teeth on Vthe main operating wheel so that as said wheel is operated the gears 28 and 29 will be rotated in opposite directions. Pivotally connected to a supporting block 38 projecting laterally from the carrier frame, y a pivot screw 40 is a shifting lever 39. One arm 41 of this lever is forked and strad. dles the grooved clutch collar 30. The other arm is bifurcated, the members 42 and 43 extending at right angles to the forked portion 4l and ibeing provided with right angled ends 44 and 45 in which is slidably mounted a rod 46 having fixed thereon a block or collar 47. ,Between this collar 47 and eachof the right-angled ends 44 and 45 are coil springs V48 and 49. Pivotally by a pivot screw 0 is a shifting arm 5l which is pivoted upon the pivot screw 40, as a result of which when the shifting arm 5l is swung about its pivot in the manner now to be described, lever 39 will also be tilted so as to shift the clutch 30 by reason of the tension placed upon either one of the springs 48 or 49 because of the movement of the block 47 and the rod 46,' means being provided, however, for preventing the shifting. of the lever 39 unt'l a spring has been placed fully `under tension. This 39 is shifted to one position one of the latches will en- The lever will beheld in'this position until near the extreme limit of the movement of the shifting device to be described later, but will be finally re'- on the l coming in contact with the inclined portion of the latch which Vforces the latch f engagement with the projection on the lever after one of the springs has been" placed'under tension by the movement of the arm 5l. The spring then quickly shifts the lever so as to throw the clutch 30 from one gear to the other, the latch being at same timereturned to normal latching po` sition by aspring 63. The shifting of the arm 5,1 to accomplish this begins to take place near the end of each oscillatory movescrew are sleeves 59 and 60 each of which through a slo-t on theV bar, preventing the sleeves from turning with the screw. YThe bar is provided with a laterally extending fork 64 which straddles the end of the shift` ing arm 5l so that when the tool holder strikes one of the pins and moves the bar 57 the shifting arm 5l will b pivot 40 and carry with beveled projection on leasing the latch which 1s holding the lever 39 so as to yby the spring which tension. rlhe shifting arm is with projecting fingers 65,

event that for any reason the spring fails to throw the lever 39, will contact the projection 56 thereon and positively move the the spring then completing the movement of the lever; these lingers acting in the nature of make-sure devices. The opening' .'51a in the arm 5l through which the pivot pin 50 extends is elongated'as shown in Fig. 7 so as to allow for the necessary movement of the parts.

also provided which, in the Tool feeding (Zeoc'ces.

As is usual in machines of this character, means are provided for feeding' the tool into the mortise at the end of each oscillatory movement' of the tool carrier. In the presgagement with' the threads of the screw by a spring 72 so that each time the screw is revolved the'carrlage and consequently the which is provided with left-handV has been placed under.

normally held in en.

plunger 71 is pulled out of engagement with the screw so that the carriage may be readily slid along the guides 1 and 2.

Devices for causing the tool to travel in a straight Zine.

portion 7 5 on the opposite side of the bar, a spring 76 being interposed between the the end 0f the recess and the chambered .portion being closed by a plug 71a. As before explained, the holder at the point where it is pivoted upon the shaft 14: is provided with an elongated opening 18, and also, as before explained, the block 25 which connects the tool holder with the screw 23 through the medium of the head 24, is slidably mounted in ways 2 This construction allows the tool holder and tool a longitudinal movement relative the other parts, this movement being determined by the curvature of the central portion 8a of the bar 8 as the tool holder rides thereon during the oscillatory movement, the curvature of this bar being such as to cause the cutting end of the tool to travel in a straight line throughout the entire length of the mortise.

In the former construction of the curved oli-set portion 8a it was necessary to vary the thickness of the same to prevent binding, the thickest portion being at the center and the bar gradually tapering therefrom. In a construction such as shown in my former application referred to, this variation and thickness of the bar caused more or less lost motion since the distance between the anti-friction balls cannot be varied. Th lost motion caused the tool to be drawn into the work by hooking in a knot or cross mortise. By the construction above ex plained, however, in which a spring is employied,` f the crossbar isl always kept in contact with the forward ball 73, the spring being sufficient to overcome the pressure of the working action of the tool, which, of course, is rearward.

By upon the shaft 14, in which it the shaft extends entirely through the tool holder and bracket 13 and beyond the same, provision is made for the attachment of a crank whereby the operator may use both hands in operating the machine.

By employing the oppositely threaded screw for the pins 61, these pins may be simultaneously and also uniformly adjusted the manner of pivoting the tool holder will be seen shiftable clutch,

pivotal connection with said block,

relative to the center of oscillation ofthe tool, which eliminates accurate measurement in adjusting for different sized mortises as well as enabling the adjustment to be more quickly made. This arrangement also prevents the pins from working loose as sometimes happens when thumb nuts are employed for holding them in their adjusted positions.

By the arrangement described in connection with the clutch shifting mechanism, an eiiective shift is accomplished at the proper point at the end of the oscillatory movement of the tool. By reason of employing but a single tooth on each of the driving pinions in connection with a single tooth on each side of the clutch collar, another desirable result is obtained in that thetool will generally be permitted a certain numf ber of revolutions before the pinion picks up the clutch for the purpose of reversing the motion 0f the screw-feed for the tool holder, thus enabling the tool to clear itself of accumulated cuttings.

Having thus described claim z- 1. In a mortising machine, an oscillatory tool, a screw having an operative connection with said tool, means for rotating said screw in opposite directions comprising a shiftable clutch, a pivoted shifting lever for said clutch, a pair of springs carried by said lever, a pivoted arm between said springs, a latch for said lever in each of its positions, a slidable bar operatively connected with said arm, and adjustable projections on said bar with which said tool contacts at the end of each oscillatory movement whereby one or the other of said springs is placed under tension and the lever released. by tripping one or the other of the latches together with means for 4simultaneously adjusting said projections.

2. ln a mortising machine, an oscillatory tool, a screw having an opera'tive connection with said tool, means for rotating said screw in opposite directions comprising a a pivoted shifting lever for said clutch, said lever having a bifurcated end, a guide rod supported by said bifurcated end, a pair of springs on said rod, a slidable block on said rod between said springs, a pivoted shifting lever having a my invention, l

for said lever 1n each of its extreme positions, a slidable bar operatively connected with said arm, and adjustable projections on said bar wi h which said Itool contacts at the end of each oscillatory movement thereof whereby one or the other of said springs is placed under tension and the lever released by tripping one or the other of said latches together with means for simultaneously adjusting said projections.

3. In a mortising machine, an oscillatory tool, a screw having an operative connection with said tool, means for rotating said screw in opposite directions comprising' reversing mechanism, an operating device for said reversing mechanism comprising two projections arranged in the path of said tool, and means for simultaneously and uniformly adjusting said projections.

In a mortising machine, an oscillatory tool, a screw having an operative connection with said tool, means for rotating said screw in opposite directions comprising reversing mechanism, operating devices for -d reversing mechanism comprising two projections arranged in the path of said tool, a shiftable screw hlaving right and kleft gether with means for holding said projections from turning whereby said projections may be simultaneously and uniformly adjusted.

5. In a mortising machine, an oscillatory tool, a screw having an operative connection with Said tool, means for rotating said screw in opposite directions comprising reversing mechanism', an operating devicefor said reversing mechanism comprising a shiftable bar, a screw rotatably mounted in said bar having right and left hand threaded portions, and two projections threaded on the respective v and projecting through a slot in said bar whereby said projections may be simultaneously and uniformly adjusted.

In a mortising machine, a support, an oscillatory tool pivotally connected to said support, the connection being such as to permit a movement of said tool relative thereto, mechanism for oscillating said tool, the conthreaded portions nection between th ing such holder comprising a swiveled block slidably.

connected with said holder, whereby vsaid holder and tool and withdrawn relative to said support during the oscillatory movement thereof.

In va mortising machinaa support, an

and means with saidsupport together with a tool carried thereby, mechanism for oscillatingsaid carrier, the connection of said holder with said support .and also withV said mechanism being such as to permit a longitudinal movement of said holder relative to said support and mechanism, a curved track on said support extending through a 4recess in said holder, anti-friction balls arranged on opposite sides of said track and between the same and said holder, and a spring arranged between one of said ballsand said holder.

In testimony vwhereof I have hereunto set my handV this 18th day of Februar 1916. Y GEORGE W. CAMPBELL. Witness: Y

.CHAs I. WELCH.

Copies of thuis patent may he obtained for five cents each, bydaddrerssing` the Commissioner of YPatents,

' Washington, D. C. l 

